Sources and field evidence
Catalog Archive: Baseline specifications compiled from historical manufacturer archives and equipment registries. Laboratory test report verification in progress.
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Engineering & Capability Benchmark
Specific output, tractive ratio, and segment percentile
Engine and power specifications
- Engine model
- Mitsubishi KE 75
- Fuel type
- Diesel
- Rated horsepower
- 17 hp
- Rated PTO Power
- N/A (Bolens specification)
- Cylinders
- 2
- Displacement
- 0.8 L (46.6 ci)
- Bore / stroke
- 3.07x3.15 inches 78 x 80 mm
- Rated RPM
- N/A
- Crankcase oil capacity
- 2.7 qts (~2.6 L)
- Coolant capacity
- 4.4 qts (~4.2 L)
Maintenance picks for the G172
Oil capacity 2.7 qts — match the filter before you drain.
Transmission and chassis specifications
- Transmission type
- Unsynchronized gear (6F/2R)
- Gears (forward / reverse)
- 6 forward / 2 reverse
- Drive system
- 2WD
- Wheelbase
- 50.4 in
- Front tire
- 4.00-12
- Rear tire
- 8-16
- Hydraulic flow
- N/A
- Rear hitch
- N/A
Implement Draft & Ballast Matcher
Simulate draft resistance, drawbar power transfer, and optimal axle weight distribution for Bolens G172.
Theoretical draft formula suggests 1,700 lbs. Official manufacturer GVWR is unrecorded for this catalog entry, so target weight is constrained to an engineering structural estimate (~135% of base operating weight) to prevent chassis overload.
Engine demand (83.4 HP) exceeds rated power (17 HP). Reduce working speed by 1.0-1.5 mph or reduce working width.
Target ballast is capped at 1,426 lbs based on structural engineering estimate (~135% base weight; official manufacturer GVWR unrecorded). Avoid adding excess ballast beyond this benchmark to protect axle bearings and chassis.
Instant Used Market Valuation Projector
Algorithmic resale estimate for Bolens G172 (1978)
Direct Segment Rivals & Showdowns
Head-to-head match-ups calibrated by horsepower and era
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Bolens
USA • 16 Models
Bolens is a storied American brand with a rich history in the outdoor power equipment industry, spanning over 150 years. Founded in the late 19th century, Bolens initially gained recognition for its innovative garden tractors and outdoor machinery. The company's early breakthroughs included the development of reliable and efficient garden tractors that became popular among homeowners and small-scale farmers. Bolens' commitment to quality and innovation was evident in its product line, which expanded to include a variety of outdoor equipment such as lawn mowers, riding mowers, string trimmers, snow blowers, tillers, and edgers. In the 1980s, Bolens entered into a strategic partnership with Iseki, a Japanese manufacturer, to produce a line of compact tractors that combined Japanese technology with American design. This collaboration resulted in the Bolens Diesel Tractor line, which was well-received for its economy and performance. However, the company's trajectory changed in 1985 when it was acquired by Garden Way, a move that marked a new chapter in its history. Despite the acquisition, Bolens continued to operate as a distinct brand, maintaining its reputation for quality and reliability. The Bolens compact tractor line was eventually discontinued in 1991, but the brand's legacy persisted through its other product offerings. Today, Bolens continues to be a recognizable name in the outdoor power equipment market, with a focus on lawn and garden machinery. The brand's enduring appeal lies in its commitment to providing durable and efficient tools for homeowners and gardening enthusiasts. While the company has evolved over the years, it remains true to its roots, offering a range of products that reflect its long-standing tradition of excellence.
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